What was found
(CAN) AIRCRAFT OPERATING DEMO FLIGHTS FOR CUSTOMER UNDER CANADIAN REGISTRATION WITH BOMBARDIER CREW. AFTER LAST DEMO FLIGHT DURING PASSENGER DEPLANING THE NR 1 FIRE WARNING ACTIVATED. CREW FIRED ONE BOTTLE (AFT) AND THE FIRE WARNING STOPPED NO EVACUATION NECESSARY. ENGINE WAS ALREADY SHUTDOWN. WARNING WAS DETERMINED TO BE A NUISANCE AS PER Q400 ISAR 2003-05 ITEM 3 'NUISANCE PEC FIRE LOOP INDICATION' 40 HRS TSN ON LOOP.